Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd23a5d72968e1da42dc057706c9867c4949aa89a25f9bc16deb7051abf6bc65f' 
  AND token = '3UrrsqPqDoycdT+SVsVYTRlDXAJFvXLZPxtrMCkctq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}